Four Cylinder Stirling Engine Model, External Combustion Hot Air Engine with Mini Electric Generator to Light Bulb and Voltmeter, DIY Metal STEM Education & Desktop Collectible Gift for Hobbyists

【Unique Four Cylinder Parallel Design】：This golden Stirling engine features two heating and two power cylinders arranged in parallel, ensuring smoother operation and stable performance. Easy to start by heating the alcohol lamp and toggling the flywheel, it delivers fast response and an eye-catching mechanical display for science enthusiasts 【Generates Electricity for Demonstration】：Not just a model, this engine drives a mini electric generator to produce about 14V power, enough to light a bulb or voltmeter. In bright spaces, you can clearly observe its operation, while in dim lighting the glowing LED creates a striking visual effect that enhances its scientific charm 【Durable Full Metal Construction】：Crafted with a solid metal body, stainless steel heating pipes, and wear-resistant pistons, this Stirling engine ensures longevity and smooth running. The polished metallic texture combines durability with aesthetics, making it suitable both as a long-term teaching model and a collectible display piece 【Educational Physics Model】：By showcasing the principle of a closed-cycle reciprocating engine, where gas is alternately compressed and expanded through external heating, this model helps users understand thermodynamics and mechanical energy conversion. Perfect for classroom demonstrations, labs, or hands-on STEM education projects 【Ideal Gift and Decorative Display】：With its elegant golden finish and fine craftsmanship, this Stirling engine is more than an educational tool—it is also a stunning decorative desktop piece. An ideal birthday, holiday, or special occasion gift for technology fans, collectors, teachers, and young learners who love science and engineering